I noted two flashes from Iridium 20 (aka 18) #24871 less than 1 second apart
just after it passed between EpsUMa (Alioth) and ZetUMa (Mizar) from North
to South. The flashes occurred at 17 Jun 1998 02:19:03 (within 5 sec) UTC.
My location is 36.058N 78.930W. I don't know my altitude, but the altitude
for Durham, NC (where I live) is 130m.
Richard McKee
richardmckee@email.msn.com
36.058N 78.930W